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Development and Evaluation of a Benchmark Aerosol Chemistry, Dynamics and Microphysics Model

Principal Investigators: Rahul Zaveri and Richard Easter

Evolution of the black carbon mixing state over two days as simulated by MOSAIC-PartMC
Evolution of the black carbon mixing state over two days as simulated by MOSAIC-PartMC. Enlarge Image

Atmospheric aerosols range from a few nanometers up to a few microns, and can be composed of a wide variety of compounds such as soluble inorganic salts and acids, insoluble crystal materials (dust), trace metals, and carbonaceous materials. This project developed a benchmark aerosol chemistry, dynamics, and microphysical model that explicitly resolves and tracks evolution of individual particles in a given aerosol population of different types. The new scheme employs a stochastic Monte Carlo technique to solve the coagulation equation while computationally-efficient deterministic numerical methods are used to integrate the stiff nonlinear ordinary differential equations arising from gas-phase photochemical reactions and gas-particle mass transfer process in a time-split fashion. The new model, called MOSAIC-PartMC, allows for the first time accurate detailed simulations of the aging of complex externally mixed aerosols due to coagulation and condensation of semi-volatile gases.

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